Just checked: I pay for 823 sqm of land (municipality in Lower Saxony, standard land value 350), living space 170 sqm (2 apartments each 85 sqm) currently in property tax B (550%) 765 euros per year.
Unfortunately, I can't find the average standard land value anywhere. Therefore, I calculate with different values:
Average 300: 622 euros
Average 250: 659 euros
Average 100: 868 euros
Interesting matter